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UNITED STATES.

PATENT OFFICE.

PETER APPEL AND OHARLES P. APPEL, OF WEST HOBOKEN, NEWJERSEY,

AND CHARLES W. HIRRLINGER, OF NEW YORK, N. Y.

INCRUSTING AND ENAMELING PRECIOUS STONES.

SPECIFICATION forming part of Letters Patent No. 240,496, dated April26, 1881..

Application filed May 13, 1880. (No model.)

To all whom it may concern Be it known that we, PETER APPEL and CHARLESP. APPEL, of West Hoboken, in the county of Hudson ,and State of NewJersey,

and CHARLES W. HIRRLINGER, of New York, in the county and State of NewYork, have invented certain new and useful Improvements in Incrustingand Enameling Precious Stones, of which the following is aspecification.

This invention relates to an improved method of incrusting and enamelingprecious stones, such as onyx and agate; and it consists in firstengraving the design into the stone to be ornamented, then pressing ormolding a thin plate of gold into the indentation, then removing,enameling, and burning the plate, next replacing and cementing the plateinto the stone and finally grinding the surface of the enameled portionsflush with the surface of the stone.

In the accompanying drawings, Figurelrepresents a side elevation; andFig. 2, a detail vertical transverse section of a ring, on line 00 a",Fig. 1, which is incrusted and enameled according to our improvedmethod,

Similar letters of reference indicate corresponding parts.

A in the drawings represents a round, flat, or other shaped piece ofonyx, agate, or other precious stone tobe ornamented. This stone ispreferably set onto'a frame, B, of gold or other metal, in such a mannerthat the side flanges of theframe are flush with the surface of thestone, so as to protect the same against breakage. The surface of thestone is ornamented with incrusted gold of difierent colors, and withenameled portions, in the following manner: I

The design to be produced is first engraved into the stone, the portionsto be enameled be ing cut of greater depth than theportio'ns which areto be incrusted merely. Into the deeper portions or indentations thinplates O, of gold or other metal, are pressed until they assume theexact shape of the indentations, the plates being then trimmed so as tocorrespond exactly to the outlines of the portion to be enameled. Theplates 0 are next removed from the recess and enameled in the usualwellknown manner. After the colors are burned into the enamel in amuffle the gold plates are replaced and cemented into the indentations,and finally ground'ofi, so as to be flush with the surface of the stoneand surrounding cas- The novel feature of our method, to which wespecially draw attention, is that the enameled and incrnsted portionsare entirely embedded into and flush with the surface of the stone,giving it a highly-ornamental appearance, as the enamel is surrounded byanarrow band ofgold. The enameled portions, being flush with thesurface, are not liable to wear ch", as the enamel is when laid on thesurface of the stone, so that the articles of jewelry retain alwaystheir finished original appearance.

Having thus described our invention, we claim as new anddesire to secureby Letters Patent 1. The method herein described of incrusting andenameling precious stones, consisting in engraving the design upon thestone, then then removing and enameling the plate, next cementing itinto the recess, and finally grindin g the surface of the enameled plateflush with the surface of the stone, substantially as set forth.

- 2. As a new article of manufacture, a precious stone for jewelryhaving incrusted and enameled ornaments set into recesses flush with thesurface of the stone, substantially as specified.

In testimony that we claim the foregoing as molding a thin plate in theengraved portions,-

our invention we have signed our names, in 8 presence of two witnesses,this 12th day of May, 1880. 4

PETER APPEL. CHAS. P. APPEL. CHARLES W. HIRRLINGER.

Witnesses:

PAUL GOEPEL, CARL KARP.

